HCPCS Code Definitions

77336

Continuing medical physics consultation, including assessment of treatment parameters, quality assurance of dose delivery, and review of patient treatment documentation in support of the radiation oncologist, reported per week of therapy

Office or other outpatient visit for the evaluation and management of an established patient, which requires at least 2 of these 3 key components: An expanded problem focused history; An expanded problem focused examination; Medical decision making of low complexity. Counseling and coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the presenting problem(s) are of low to moderate severity. Typically, 15 minutes are spent face-to-face with the patient and/or family.

77370

Special medical radiation physics consultation

99211

Office or other outpatient visit for the evaluation and management of an established patient, that may not require the presence of a physician or other qualified health care professional. Usually, the presenting problem(s) are minimal. Typically, 5 minutes are spent performing or supervising these services.

99204

Office or other outpatient visit for the evaluation and management of a new patient, which requires these 3 key components: A comprehensive history; A comprehensive examination; Medical decision making of moderate complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the presenting problem(s) are of moderate to high severity. Typically, 45 minutes are spent face-to-face with the patient and/or family.

99203

Office or other outpatient visit for the evaluation and management of a new patient, which requires these 3 key components: A detailed history; A detailed examination; Medical decision making of low complexity. Counseling and/or coordination of care with other physicians, other qualified health care professionals, or agencies are provided consistent with the nature of the problem(s) and the patient's and/or family's needs. Usually, the presenting problem(s) are of moderate severity. Typically, 30 minutes are spent face-to-face with the patient and/or family.

Publications

Arynes are unique aromatic species that display versatile reactivity in a variety of transformations. It has been demonstrated that the reaction profiles of arynes can be altered by transition metal additives, and one of the earliest examples of the metal additive effect was observed with silver ions (Ag(+)). Especially, in the presence of Ag(+), benzyne showed distinctive reactivity and selectivity toward Ï€-nucleophiles compared to the corresponding reaction in its absence. Although more experimental data need to be accumulated to accurately define the Ag(+) additive effect, based on its role displayed in various transformations, we can infer that Ag(+) interacts with arynes to form a reactive intermediate, which behaves like a silver-bound aryl cation or 1,2-carbene-silver carbenoid. In this tutorial review, various aryne-mediated reactions involving Ag(+) or other organosilver species are discussed, which show a bird's-eye view on the Ag(+) effect in aryne chemistry such that further explorations of the unique reactivity of arynes under the influence Ag(+) will be inspired.

The intramolecular [3+2] cycloaddition (32CA) of alkene-tethered Î±-silyloxydiazoalkanes provides variable stereoselectivity in generating bicyclic pyrazolines where the silyloxy group is either syn or anti to the newly formed pyrazoline ring. To elucidate the origin of the stereoselectivity, density functional theory (DFT) calculations were carried out for the energy of each transition state structure (TSs) and product. Steric effects were identified as the major determining factors in the diastereoselectivity of the 32CA reaction with regards to substrate structure (cyclic or acyclic Î±-silyloxydiazoalkanes).

Synthesis of the Carbocyclic Core of Massadine. - Organic letters

The carbocyclic core of massadine has been synthesized relying on a stereoselective formal [3 + 2] cycloaddition of lithiumtrimethylsilyldiazomethane with Î±,Î²-unsaturated esters to form a Î”(2)-pyrazoline moiety followed by facile N-N bond cleavage. A unique feature of the current approach is the direct installation of the tertiary Î±-amino center and a Î²-cyano group in a cis arrangement on the resulting cyclopentane framework via a previously developed formal aminocyanation protocol.

Novel oxidative dimerization of silylallenes is described. Treatment of silylallenes with a catalytic amount of copper(I) chloride, a substoichiometric amount of N-hydroxyphthalamide, and a stoichiometric amount of a terminal oxidant diacetoxyiodobenzene afforded head-to-head dimers as the main products. Silyallenes containing a small ring afforded only dimers, whereas as the ring size increased 1,3-enynes became more favorable products. For silylallenes containing an acyclic substituent, dimer formation is a norm with exceptions where N-hydroxyphthalimide reacts at the propargylic center to generate the corresponding aminoxy ethers.

Trapping of arynes with various nucleophiles provides a range of heteroatom-functionalized arene derivatives, but the corresponding reaction with water does not provide phenol derivatives. Silver trifluroacetate (AgOâ‚‚CCFâ‚ƒ) can nicely solve this problem. It was found that in typical organic solvent, AgOâ‚‚CCFâ‚ƒ readily reacts with arynes to generate trifluoroacetoxy organosilver arene intermediate, which, upon treating with silica gel, provides phenolic products. This protocol can be extended to the synthesis of Î±-halofunctionalized phenol derivatives by simply adding NBS (N-bromosuccinimides) or NIS (N-iodosuccinimides) to the reaction along with silver trifluroacetate, which provided Î±-bromo or Î±-iodophenol derivatives in good yield. However, the similar reactions with NCS (N-chlorosuccinimides) afforded only the protonated product instead of the expected Î±-chlorophenols derivatives. Interestingly, substrates containing silyl substituents on 1,3-diynes resulted in Î±-halotrifluoroacetates rather than their hydrolyzed product. Additionally, trapping the same arynes with other oxygen-based nucleophiles containing silver counter cation, along with NXS (N-halosuccinimides), generated Î±-halooxyfunctionalized products.

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